1.8 8v gti into 1.3 carb mk2 golf

[shakeyjakeveedub]

Hi i am currently purchashing a 1990 g reg mk2 1.3 carb golf and i have a j reg mk2 5 door gti 1.8 8v and i am just wondering what i wud need to do to put the gti engine into the 1.3. I understand i will need to use the gti tank and pump and other stuff but i am wondering what exactly i need to do with the wiring ie splicing looms together or is it basic plug and play?

any help would be appreciated thanks callum

[rubjonny]

pretty much everything needs swapping over in the engine bay, brake servo, front calipers, brake lines to rear of car + beam and discs assuming you want to fit rear discs, (recomended to at least swap the rear beam as it has integral anti roll bar) lines under the car, both fuel pumps as well as relays from fusebox and wiring to the rear of the car (or just chop out the fuel pump loom from the donor)  The actual tank does not need to be swapped but probably just as easy too since fitting the lines between the lift pump & main pump is tricky without dropping the tank at least a little.

Wiring depends on if the G reg 1.3 is actually a 90spec, or a late regged pre-90.  If the hazard switch is on the column then its a 90spec and the engine/rear loom will plug in, if on dash its a pre-90 and for plug n playness the entire car loom needs swapping

[shakeyjakeveedub]

does this mean that if the hazard swith is on the steering column then i will just have to find the fuel pump loom and plug it in. Will i just need to swap the engine loom and fusebox? plus is there a guide anywhere to wiring this up as i am quite new to vws lol.

cheers callum

[rubjonny]

the fuel pump loom is included in the main loom that powers everythig in the rear of the car, you could chop the pump loom out of the donour car but if it wa me I would just swap the whole loom over.  the wiring into the tailgate unplugs behind the passenger side C pillar so its arguably easier to swap the whole thing over rather than finding the pump loom part and cutting open the loom wrap to retrieve it.  I guess you would want to fit the GTI black carpet anyway so then its just a case of unplugging the rear loom and swapping it over!

If the hazard switch is on the column the 1.3 fusebox is the same as the one in the GTI, so its just the engine loom that needs swapping, the lighting loom from the 1.3 can stay

Check out the fusebox FAQ that should help you, if it was me and the 1.3 was a pre-90 spec, I'd rewire the entire car to 90 spec since you have the donor car there with everything you need, but thats your choice.  Main difficulty there is the stering column bracket and fusebox hanger have to be swapped, and to make your life easier the dash needs to come out to remove the dash loom.  While the dash is out that would be a great time to swap in a new heater matrix and bin the bypass valves if fitted, but again thats your choice

[shakeyjakeveedub]

cheers for the advice. i will find owt for definite tommorow whether it is pre or post 90 hopefully post as it wud make it a hell of alot easier by the sounds of it. if they have the same fusebox will the loom just plug straight in? also is there a guide on here showing this conversion? again thanks. callum

[rubjonny]

yeah its plug n play if the same fusebox, keep the other one for spares though they loke to leak water on the fusebox and this causes odd electrical problems
Its relatively straight forward mostly a case of swap bits over that are different, there are a few threads on this kind of job but it can take a bit of effort to find them.

[shakeyjakeveedub]

cheers for that, i found out today that the hazard switch is on the column which has macde me feel alot happier  lol. On the 5 door gti that i have there is a flick switch in which is to bypass the immobiliser but i wud rather have none at all, any way i can get round this? also i noticed today that there is sum sort of microswitch on the throttle which is activated at full throttle, i was just wondering wot this is??
 
thanks callum
 

[rubjonny]

you need to get behind the dash, follow that switch to where it goes.  once you find the imobilisor box it should become obvious where it has been spliced into, its just a case of matching the wire colours that have been chopped and joining them back together!

As for the switch, thats the wide open throttle switch, tells the ECU the throttle is wide open

[shakeyjakeveedub]

Wud u reccomend that i label all of the plugs and wot not to make things easier? and wen i take the tank owt of the gti will i take the wiring and just plug it into the 1.3 loom, wud this work? Do the plugs on the back of the fusebox just clip off and will i just clip the ones from the gti loom into them? thanks again callum

[rubjonny]

yeah it'll help you figure out where they go, vw looms are petty good though usually the plug/wire colours match and generally they will only plug into the right spot.  Once you drop the tank down follow the loom back and drag out the wiring to the rear of the car, it'll plug right into the 1.3 fusebox.  The fusebox plugs will all only plug in the correct spot, the alignment tabs, shape of the plug and pin layour for each is unique
One thing though, once you drop the fusebox notice there is liek a bar along the back in the middle.  There is a tab at 1 end you need to pull outwards, this releases all the locking tabs along the middle.  then the other end of the plug has a clip, release that and the plug will come out.